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Investments (Tables)
 12 Months Ended
Dec. 31, 2014
Investments Disclosure [Abstract]  
Equity Method, Available for Sale Securities, and Other Investments
MGE EnergyMGE
(In thousands)2014201320142013
Available for sale securities:
Cost basis$1,964 $1,736 $489 $490
Gross unrealized gains765 629 240 321
Fair value$2,729 $2,365 $729 $811
Equity method investments:
ATC$67,673 $64,488 $67,673 $64,488
Other1,199 1,099 --
Total equity method investments$68,872 $65,587 $67,673 $64,488
Other investments159 ---
Total$71,760 $67,952 $68,402 $65,299

During the years ended December 31, 2014 and 2013, certain investments were liquidated. As a result of these liquidations, MGE Energy and MGE received the following:

MGE EnergyMGE
(In thousands)201420132012201420132012
Cash proceeds$38 $39 $-$-$16 $-
Gain (loss) on sale21 2 --(3)-
ATC's Summarized Financial Data

For the years ended December 31, 2014, 2013, and 2012, MGE Transco recorded the following:

(In thousands)201420132012
Equity in earnings from investment in ATC$9,150 $9,434 $9,079
Dividends received from ATC7,740 7,404 7,146
Capital contributions to ATC1,775 1,420 2,131

ATC's summarized financial data for the years ended December 31, 2013, 2012, and 2011 is as follows:

(In thousands)
Income statement data for the year ended December 31,201420132012
Operating revenues$635,033 $626,336 $603,254
Operating expenses(307,451)(295,069)(280,999)
Other income (expense)117 831 (2,533)
Interest expense, net(88,970)(84,484)(82,296)
Earnings before members' income taxes$238,729 $247,614 $237,426
Balance sheet data as of December 31,201420132012
Current assets$66,410 $80,715 $63,134
Noncurrent assets3,728,675 3,509,517 3,274,704
Total assets$3,795,085 $3,590,232 $3,337,838
Current liabilities$313,065 $381,467 $251,541
Long-term debt1,701,000 1,550,000 1,550,000
Other noncurrent liabilities163,818 126,167 95,829
Members' equity1,617,202 1,532,598 1,440,468
Total members' equity and liabilities$3,795,085 $3,590,232 $3,337,838